Hello! I recently planted heirloom tomatoes in large self watering containers using black plastic mulch. I am already seeing signs of white flies and have aphids on a nearby plant (worried they'll travel). I read that silver mulch is great for this. Can I place silver mulch on top of the black mulch? Should I remove black mulch first? Also, should I still use the insecticidal spray? I'd love to avoid the spray if possible! Thank you!
